I have some feedback for you:
First off, wow. This map is very pretty. I love that you used the glass texture that everyone stays away from and managed to make it look good at the same time. Bravo.
Second, not much is clipped on this map. I know this is an alpha but clipping is still super important. Stairs at the current moment can halt movement from jumping or rocket jumping, and the camera bobbing while walking up is annoying.
Third, I'm not sure everything was packed correctly:
Fourth:
This is a bad idea. You should try to use less lights, but increase their brightness. You have too many light entities for this room. Delete most and only leave a couple, and increase the brightness by doing this:
Change the default brightness from [255 255 255 200] to [255 255 255 800]. You can experiment with other values like 500, 600, 700, etc. I would also recommend experimenting with some light_spot entities. (You can also increase their intensity with the same value changes)